JP2000219029A - Cabin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the noise reductivity of a roof and reduce the noises of a cabin by attenuating the noises entering from an outside air guide port in the roof of the cabin mounted on a tractor into the roof. SOLUTION: A partition wall 46 which is located crosswisely and inwardly from an outside air guide port 42 for closing between an extending wall portion and an upper wall portion and has noise reductivity is provided between the extending wall portion and the upper wall portion of an outer roof 14, ranging from the rear end to the front part of the outer roof 14. An outside air flow passage 51 which is encircled by a noise absorbing material 48 and has the rear end closed and the front end opened and communicated with the outside air guide port is provided between a partition wall 46 and a peripheral wall portion 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cabin mounted on a tractor or the like.

[0002]

2. Description of the Related Art Conventionally, a roof of a cabin mounted on a tractor is formed in a hollow shape by an inner roof disposed inside a cabin room and an outer roof disposed above the inner roof. An air conditioner for adjusting the air in the cabin is housed in the roof. Further, an outside air introduction port for introducing outside air into the roof is opened at a rear portion of a side portion of the outer roof.

[0003]

In the above-mentioned conventional apparatus, the external sound that has entered through the outside air inlet is transmitted to the cabin room through the inner roof, which contributes to the noise in the cabin room. In view of the above problems, it is an object of the present invention to prevent a sound entering from an outside air inlet from being transmitted to a cabin room and reduce noise in the cabin room.

[0004]

The first technical means taken by the present invention to solve the above technical problem is to form a roof having a hollow shape and to provide air conditioning in a cabin chamber in the roof. In a cabin provided with an air conditioner for performing the operation, the outside air is introduced into the roof from the outside air introduction port through the outside air introduction port formed in the roof, ,
An outside air introduction duct having a sound absorbing material is provided on the inner surface side.

In a second technical means, the roof is formed in a hollow shape, and the roof is provided with an air conditioner for adjusting the air in the cabin inside the roof, and is formed at a rear portion of a side portion of the roof. In a cabin that introduces outside air into the roof from the outside air inlet,
An outside air introduction duct provided with a sound absorbing material is provided on the inner surface side while extending forward from the outside air introduction port, and the outside air introduction port is communicated with the outside air introduction duct, and the inside of the duct is provided at the front end side of the outside air introduction duct. An outlet for flowing outside air is provided.

A third technical means is that a roof is formed in a hollow shape from an inner roof disposed inside the cabin and an outer roof disposed above the inner roof, and the roof is formed inside the roof. An air conditioner for adjusting the air in the cabin is provided, wherein the outer roof has an upper wall, a peripheral wall extending downward from a peripheral edge of the upper wall, and a lower edge of the peripheral wall. A cabin configured to include an extension wall portion extending inward in the horizontal direction, and to introduce outside air into the roof from an outside air introduction port formed at a rear portion of a side portion of the extension wall portion. In the above, between the extending wall portion and the upper wall portion, it is located on the inner side in the left-right direction from the outside air introduction port, closed between the extending wall portion and the upper wall portion, and provided with sound insulation. A partition wall is provided from the rear end of the outer roof to the front, Between the partition wall and the peripheral wall portion, together with the surrounded by sound absorbing material, the rear end is characterized in that the front end is closed is provided outside air passage communicating with the opening shape is and outside air inlet.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, arrow A indicates the front, and arrow B indicates the left-right direction. In FIG. 2, 1
Is the tractor body, engine 2, transmission case 3
A cabin 4 is mounted at the rear of the vehicle body 1. The cabin 4 includes a cabin frame F serving as a framework, and the cabin frame F
A pair of left and right front struts 5 arranged at the front, a pair of left and right rear struts 6 arranged at the rear, and a pair of left and right middle struts 7 arranged between the front and rear struts 5, 6 are provided. An upper front frame member 8A connecting the upper ends of the columns 5, an upper rear frame member 8B connecting the upper ends of the left and right rear columns 6, and an upper side connecting the upper ends of the front and rear columns 5, 6 on the same left and right sides. Frame material 8C
And a box-shaped frame shape provided with an upper frame 8 and the like composed of

A windshield is provided between the left and right front supports 5, a rear glass 9 is provided between the left and right rear supports 6, an entrance door 10 is provided between the front support 5 and the intermediate support 7, and an intermediate support 7 and the rear support are provided. 6 and the side glass 11
Fenders 22 that cover the rear wheels are provided on the lower side of the vehicle. A roof 12 is provided on an upper portion of the cabin frame F. As shown in FIGS. 4, 7, and 8, the roof 12 is disposed inside the cabin and forms an inner roof that forms a ceiling in the cabin. 13 and an outer roof 14 located above the inner roof 13 are hollow (middle), and have a space inside. An air conditioner device 15 is provided in the interior space of the roof 12.

As shown in FIGS. 1 and 4, the air conditioner device 15 includes an air conditioner body 16 containing an evaporator 21 for evaporating a refrigerant and removing heat from the surroundings to cool the surroundings. , An air outlet duct 17 connected to the left and right sides of the air conditioner main body 16, a front air outlet duct 19 connected to the front of the air conditioner main body 16, and an air inlet duct 17. And a pair of left and right air introduction blowers 20 provided on the rear end side. In the hood of the tractor, a compressor for compressing the refrigerant, a radiator (condenser) for condensing and liquefying the refrigerant compressed by the compressor, and decompressing the refrigerant liquefied by the radiator. The evaporator 21 vaporizes the refrigerant decompressed by the expansion valve, and returns the refrigerant to the compressor so that the evaporator 21 returns to the compressor. And so on.

The rear portion of the air introduction duct 17 is formed in a bifurcated shape so that air can be introduced from the rear end thereof, and a blower 20 is provided at each rear end of the air introduction duct 17. Therefore, by operating the blower 20, the air in the roof 12 is introduced into the air conditioner main body 16 via the air introduction duct 17.
The evaporator 21 described above is provided in the air conditioner main body 16, and a radiator capable of supplying and discharging the medium heated by the engine is provided. The cool air from the evaporator 21 or the mixed wind of the warm air and the cool air is supplied to the side blow duct 18 or the front blow duct 19 or the duct 1
It is possible to discharge from both 8 and 19.

The inner roof 13 is shown in FIGS.
As shown in the figure, the front and rear edges and the left and right edges are attached and fixed to the lower surface of the upper frame 8 of the cabin frame F via bolts or the like. A front guide duct 29 connected to the front air outlet duct 19 of the air conditioner 15 is provided at the center of the front part of the inner roof 13 in the left-right direction. Is provided with a side guide duct 30 connected to the side blow duct 9 of the air conditioner 16. The front guide duct 29
On the lower surface side and side surfaces of the side guide duct 30, air outlets 31 and 32 for blowing out conditioned air into the cabin are provided.

At the center of the rear of the inner roof 13 in the left-right direction, as shown in FIGS. 1, 4 and 8, an inside air inlet 33 for opening the air in the cabin into the roof 12 is opened. ing. A filter 34 is attached to the inside air introduction port 33 from the lower side so as to fit inside, and the inside air introduction port 33 is configured to be opened and closed by an inside / outside air switching damper 35 from above. . The outer roof 14 is formed of a resin plate, an iron plate, or the like, and as shown in FIGS. 1, 3, 4, and 7, the upper wall 37 and the entire periphery of the upper wall 37 (plate surface). A peripheral wall portion 38 integrally extends downward from the front, rear, left and right ends), and extends integrally inward in the lateral (horizontal) direction from the entire periphery of the lower edge portion of the peripheral wall portion 38. And an extended wall portion 39.

The extending wall portion 39 of the outer roof 14 is superimposed on the upper frame 8 of the cabin frame F via a sealing member 41, and is fixed to the upper frame 8 via bolts or the like. . In addition, a rising wall portion 40 that rises up over the entire circumference is integrally provided at the inner edge of the extending wall portion 39. The rear left and right sides of the outer roof 14 protrude outward in the left-right direction beyond the cabin frame F, and the extension wall 39 of each of the left and right protruding portions 14A has an outside air inlet for taking in outside air into the roof 12. 42 is open.

A filter 43 is fitted into the outside air inlet 42 from below, and the filter 43 is attached and fixed to the extension wall 39 so as to close the outside air inlet 42 from below. It is held by a plate 44. Also,
The mounting plate 44 is provided with a ventilation port 45 which is formed of a number of small holes and corresponds to the outside air introduction port 42. In addition, a recess 5 in which a headlight is housed is provided on the front side of the peripheral wall portion 38.
4 are formed. As shown in FIGS. 1, 3, 5, and 6, the inner wall of the outer roof 14 is provided with an extension wall portion 39 and an upper wall portion 37 on the inner side in the left-right direction from the outside air inlet 42. A partition wall 46 is provided therebetween and closes between the extending wall portion 39 and the upper wall portion 37.

The partition wall 46 is formed of a material having a sound insulating property, such as a foamed rubber plate or an iron plate.
4 is provided from the rear end to the front part (that is, the rear end of the partition wall 46 is in contact with the rear surface side of the peripheral wall part 38 of the outer roof 14, and the front end of the partition wall 46 is Is located at an interval from the front side of the peripheral wall portion 38). In the present embodiment, the partition wall 46 is formed of a foamed rubber plate, and is interposed between the upper wall portion 37 of the outer roof 14 and the rising wall portion 40 in a compressed manner.

The partition wall 46 and the outer roof 14
The upper wall portion 37, the peripheral wall portion 38, and the extension wall portion 39 form a space portion 47 in which the rear end side is closed and the front end side is open, and inside the space portion 47, the entire inner surface is formed. A sound absorbing material 48 is provided. A communication hole 49 communicating with the outside air inlet 42 is formed in the sound absorbing material 48. Therefore, the partition wall 46, the upper wall portion 37, the peripheral wall portion 38 and the extension wall portion 39 of the outer roof 14,
An outside air introduction duct 50 extending forward from the rear end of the outer roof 14 is formed by the sound absorbing material 48. The inside of the outside air introduction duct 50 communicates with the outside air introduction port 42, and the rear end side is closed. The front end side has an opening shape, serves as an outlet 53 for outside air flowing through the duct 50, and serves as an outside air flow passage 51 surrounded by a sound absorbing material 48.

The outside air introduction ducts 50 are provided on both left and right sides in the roof 12 so as to extend substantially in the front-rear direction. A space between the left and right outside air introduction ducts 50 and a storage space 52 for accommodating the air conditioner 15 is provided. Have been. The inside / outside air introduction damper 35 switches the inside air introduction port 3.
3 is closed, and the blower 20 of the air conditioner device 15 is operated, so that outside air is introduced into the outside air introduction duct 50 from the outside air introduction port 42 through the ventilation port 45 and the filter 43, and the inside of the outside air introduction duct 50 Outside air introduced into the duct 50 flows forward through the outside air flow passage 51 in the duct 50,
The storage space 5 of the air conditioner 15 from the front end side of the duct 50
2 will flow out.

If the inside air inlet 33 is opened by the inside / outside air switching damper 35, the air (inside air) in the cabin room is introduced from the inside air inlet 33 into the storage space 52 of the air conditioner 15, and the outside air inlet 42 From this, little or no outside air is introduced. In addition, the sound outside the cabin room that enters the roof 12 from the outside air inlet 42 is blocked from being transmitted to the storage space 52 of the air conditioner 15 through the partition wall 46, and the sound that enters from the outside air inlet 42 is The sound is attenuated by the sound absorbing material 48 and the like from the rear end side to the front end side of the outside air introduction duct 50, whereby the sound insulation of the outer roof 14 is improved, so that the noise in the cabin chamber can be reduced.

Further, by providing ducts 50 extending in the front-rear direction on both left and right sides of the outer roof 14,
Through a wall constituting a side portion of the outer roof 14,
It is also possible to prevent transmission of sound from the outside into the roof 12. Even if the sound absorbing material 48 is not provided, the sound transmitted through the outside air introducing duct 50 can be attenuated.
The damping effect (the sound insulating effect of the outer roof 14) can be remarkably improved by providing. Further, in the above configuration, the outside air introduction duct 50 can be formed by adding the partition wall 46 and the sound absorbing material 48 to the outer roof 14, and the design change of the outer roof 14 is unnecessary.

FIG. 9 shows another embodiment, which is arranged on the outer side in the left-right direction of the rising wall portion 40.

[0021]

According to the present invention, the sound outside the cabin room that enters from the outside air inlet is attenuated in the outside air introduction duct, so that the sound insulation of the roof is improved and the noise inside the cabin room can be reduced. . In addition, by providing an outside air introduction duct having a sound absorbing material on the inner side and extending forward from the outside air introduction port on a side portion in the roof, noise in the cabin chamber can be reduced in the same manner as described above, and the roof can be reduced. Intrusion of sound from the side can also be prevented.

Further, between the extending wall portion and the upper wall portion of the outer roof, the outer roof is located on the inner side in the left-right direction with respect to the outside air introduction port, and closes between the extending wall portion and the upper wall portion. A partition wall having sound insulation properties is provided from the rear end to the front part of the outer roof, and between the partition wall and the peripheral wall part, the rear end is closed and the front end is open while being surrounded by a sound absorbing material; and By providing the outside air flow passage communicating with the outside air introduction port, the sound outside the cabin room entering from the outside air introduction port is attenuated in the outside air flow passage, and is sound-insulated by the partition wall, and the sound insulation of the roof is improved. The noise in the cabin can be reduced, and sound can be prevented from entering from the side of the outer roof.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part.

FIG. 2 is a side view of the cabin.

FIG. 3 is a bottom view of the outer roof.

FIG. 4 is a side sectional view of a roof.

FIG. 5 is a sectional view taken along line CC of FIG. 1;

FIG. 6 is a sectional view taken along the line DD in FIG. 1;

FIG. 7 is a perspective view of an outer roof and a cabin frame.

FIG. 8 is a perspective view of an inner roof and a cabin frame.

FIG. 9 is a cross-sectional view of an outside air circulation duct showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Roof 13 Inner roof 14 Outer roof 15 Air conditioner 37 Upper wall part 38 Peripheral wall part 39 Extension wall part 42 Outside air introduction port 46 Partition wall 48 Sound absorbing material 50 Outside air introduction duct 51 Outside air passage 52 Storage space 53 Outlet

Claims (3)

[Claims] 1. A roof having a hollow shape, and an air conditioner for adjusting air in a cabin chamber is provided in the roof, so that outside air is introduced into the roof from an outside air inlet formed in the roof. A cabin, characterized in that outside air is circulated from an outside air inlet to a storage space of an air conditioner in a roof, and an outside air introduction duct provided with a sound absorbing material is provided on an inner surface side of the cabin. 2. A roof having a hollow shape, an air conditioner for adjusting the air in the cabin inside the roof, and an outside air inlet formed in a rear portion of a side portion of the roof. In the cabin in which the outside is introduced, on the side part in the roof, while extending forward from the outside air introduction port, an outside air introduction duct provided with a sound absorbing material on the inner surface side is provided,
A cabin wherein an outside air introduction port is communicated with the outside air introduction duct, and an outlet for outside air flowing through the duct is provided at a front end side of the outside air introduction duct. 3. A roof having a hollow shape formed of an inner roof disposed inside the cabin and an outer roof disposed above the inner roof, and adjusting the air in the cabin inside the roof. The outer roof includes an upper wall, a peripheral wall extending downward from a peripheral edge of the upper wall, and a laterally inward extending from a lower edge of the peripheral wall. A cabin configured to include an extended wall portion, and configured to introduce outside air into the roof from an outside air inlet formed at a rear portion of a side portion of the extended wall portion. A partition wall, which is located on the inner side in the left-right direction from the outside air introduction port and closes between the extending wall portion and the upper wall portion and has a sound insulating property, is provided between the outer roof and the wall portion. Provided from the end to the front part, the partition wall and the peripheral wall To, with surrounded by sound absorbing material, front end is closed rear end, characterized in that a fresh air flow passage which communicates with the opening shape is and external air inlet port cabin.